US9923432B2 - Electric motor for a motor vehicle with EMC measure - Google Patents
Electric motor for a motor vehicle with EMC measure Download PDFInfo
- Publication number
- US9923432B2 US9923432B2 US14/966,441 US201514966441A US9923432B2 US 9923432 B2 US9923432 B2 US 9923432B2 US 201514966441 A US201514966441 A US 201514966441A US 9923432 B2 US9923432 B2 US 9923432B2
- Authority
- US
- United States
- Prior art keywords
- electric machine
- winding overhang
- shielding element
- flux
- motor vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/42—Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
- H02K11/014—Shields associated with stationary parts, e.g. stator cores
- H02K11/0141—Shields associated with casings, enclosures or brackets
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- H02K11/022—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/12—Machines characterised by the bobbins for supporting the windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to an electric machine for a motor vehicle.
- the electric machine has a rotor and a stator.
- the electric machine For driving the rotor, the has a coil device for generating a rotary field. At least one winding overhang of the coil device protrudes from a flux-guiding device of the stator, i.e., for example the laminated core, into an environment of the stator.
- the invention also includes a motor vehicle with the electric machine.
- a torque is generated by the stator by means of a magnetic rotary field and is applied to the rotor.
- individual electric coils of a coil device are alternately impinged with an electric current.
- Switching of the currents can be accomplished by an inverter. During the switching, switching edges occur in the form of high-frequency AC current signals and/or AC voltage signals, i.e., generally in the form of electrical disturbances in the electric machine.
- a particular problem encountered in a motor vehicle is that the electric machine is surrounded by a plurality of electrically conducting components into which the electrical disturbances can be transmitted, for example via capacitive coupling.
- BEV battery electric vehicle—electric car
- the electrical disturbances are of a magnitude so as to be emitted as electromagnetic interference radiation after being transmitted by the components, and as a result may for example interfere with radio reception in the motor vehicle.
- the measures known from the state of the art do not allow reducing an electrical disturbance originating from the electric machine, i.e., an electric field of interference or electromagnetic radiation, without adversely affecting the efficiency of the electric machine.
- an electric machine for a motor vehicle includes a rotor configured for mechanical coupling with a drive shaft; a stator having a coil device for generating a magnetic rotary field for driving the rotor and having a soft magnetic flux-guiding device for guiding the rotary field, wherein the coil device is only partially arranged in the flux-guiding device and at least one winding overhang of the coil device extends out of the flux guiding device into an environment of the stator; and an electrically conductive shielding element arranged on the at least one winding overhang and configured to electrically and/or electromagnetically shield the winding overhang against an environment, wherein the shielding element is connected to a frame potential connection of the electric machine.
- an electric machine for a motor vehicle has a rotatably supported rotor, which can be mechanically coupled with a drive shaft.
- the rotor can for example have a flange.
- the rotor can for example be rotatably supported in a housing of the electric machine.
- the electric machine also has a stator for a drive of the rotor.
- the stator has a coil device for generating a magnetic rotary field for driving the rotor.
- a soft magnetic flux device is provided, for example a laminated core as it is known from the state of the art.
- the coil device one or more electrical coils can be formed.
- the coil device is only partially arranged in the flux-guiding device, as is known. At least one winding overhang of the coil device extends out of the flux-guiding device into an environment of the stator.
- a respective electrically conducting shielding element which is electrically connected with the frame potential connection of the electric machine, is arranged on the at least one winding overhang and configured to electrically and/or electromagnetically shield the winding overhang against the environment.
- the frame potential connection can for example be formed by a flange of a housing of the electric machine via which the electric machine can be fastened on a carrier element in a motor compartment of the motor vehicle.
- the frame potential connection can also be formed by a so-called mass band, for example a litz wire.
- the electric machine according to the invention has the advantage that an electrical disturbance emitted via the winding overhang, i.e., an electric field and/or an electromagnetic radiation, ends at the shielding element, which can be brought to the frame potential as a result of the electrically conducting connection to the frame potential connection.
- an electrical disturbance emitted via the winding overhang i.e., an electric field and/or an electromagnetic radiation
- the electric conductivity of the shielding element and the electric conductivity of the electric connection between the shielding element and the frame potential connection has to be configured sufficiently high.
- the conductivity has to be sufficient so that an electrical disturbance emitted from the winding overhang is below a predetermined maximal value in an area beyond the shielding element.
- the maximal value can be determined by a person with skill in the art depending on the situation.
- the following parameters are particularly suited for adjusting the electrical conductivity: the material of the shielding element, which preferably includes aluminum and/or copper.
- the material thickness of the shielding element, wherein the shielding element can for example include a sheet metal which has a sheet thickness of at least 0.3 millimeters.
- the line cross section is preferably at least 0.3 square centimeters.
- each winding overhang is preferably electrically insulated against the respective winding overhangs and/or against the flux-guiding device, i.e., for example the laminated core, and/or the flux-guiding device. This prevents eddy currents.
- the respective shielding element is at least partially arranged between the winding overhang and the rotor. This advantageously avoids that a potential fluctuation, which would otherwise be generated by the winding overhang in the rotor, is transmitted as AC current into a rotor shaft or drive shaft and from there emitted into the motor vehicle as disturbance radiation, because the shaft acts as antenna.
- the respective shielding element is at least partially arranged between the winding overhang and the region in which the properly mounted shaft extends. This also effectively prevents or at least reduces a direct transmission of the electrical disturbances from the winding overhang toward the shaft.
- a line cross section i.e., an electrically conductive cross section
- an electrically conductive cross section can be smaller in the respective shielding element than a diameter of the winding overhang, in particular smaller than a quarter of the diameter of the winding overhang, preferably smaller than an eight of the diameter of the winding overhang.
- the conductive cross section is hereby the greatest dimension of the electrically conductive shielding element measured perpendicular to the current direction of the equalizing current in the shielding element.
- the respective shielding element has at least one wire and/or a strip-shaped conducting element, i.e., a strip conductor.
- a strip-shaped conducting element i.e., a strip conductor.
- the respective wire and/or the strip-shaped conductor element are hereby preferably electrically coupled with the frame potential connection only at a single connection site, in particular at a respective end of the wire and/or conductor element. This also prevents a loop formation over the shielding element and over further electrically conductive elements.
- strip-shaped conductor elements have the advantage that their effective shielding surface is greater at same weight.
- an embodiment of the invention provides that the respective shielding element is wound about the respective winding overhang.
- the shielding element is thereby rendered helical.
- the shielding element can have a comb structure and/or a fishbone structure. Such structures have also proven advantageous with regard to suppressing eddy currents.
- the respective shielding element can for example be glued to the winding overhang.
- the respective shielding element is enclosed in a carrier element, in particular in a cap or in a chamber.
- the carrier element is made of an electrically conductive material and the shielding element is held by the carrier element on the respective winding overhang. Provision of a carrier element has the advantage that the shielding element can be arranged on the respective winding overhang with little effort during mounting of the electric machine.
- the carrier element can be pushed onto the winding overhang and/or is clipped on by means of a clip connection. This reduces the mounting effort to a single mounting step and with this the manufacturing costs for the electric machine.
- a motor vehicle includes an electric machine, wherein the electric machine includes a rotor mechanically coupled with a drive shaft via which the motor vehicle can be driven for a drive; a stator having a coil device for generating a magnetic rotary field for driving the rotor and having a soft magnetic flux-guiding device for guiding the rotary field, wherein the coil device is only partially arranged in the flux-guiding device and at least one winding overhang of the coil device extends out of the flux guiding device into an environment of the stator; and an electrically conductive shielding element arranged on the at least one winding overhang and configured to electrically and/or electromagnetically shield the winding overhang against an environment, said shielding element being connected to a frame potential connection of the electric machine, wherein the frame potential connection of the electric machine is electrically conductively connected with a frame potential of a high-voltage on board grid of the motor vehicle or with a body and/or a metallic support structure of the motor vehicle.
- the coupling between the rotor and the drive shaft can be direct or can be accomplished via a transmission.
- the frame potential connection of the electric machine can be electrically conductively connected for example with a cross beam or a longitudinal beam or a floor panel, and/or with a frame potential of a high-voltage on-board grid of the motor vehicle.
- the term high-voltage means in this context an electric voltage, which is greater than 60 Volts, in particular greater than 100 Volts.
- the motor vehicle according to the invention is preferably configured as a passenger car.
- FIG. 1 is a schematic representation of an embodiment of the motor vehicle according to the invention
- FIG. 2 is a schematic representation of a longitudinal section of an electric machine which can be provided in the motor vehicle of FIG. 1 ,
- FIG. 3 is a schematic representation of a perspective view of an electric coil of a coil device of the electric machine of FIG. 2 ;
- FIG. 4 is a schematic representation of a front view of the electric coil of FIG. 3 with a winding overhang and a shielding element.
- a motor vehicle 1 which can be an automobile, in particular a passenger car.
- the motor vehicle 1 can for example be configured as hybrid vehicle with a (not shown) internal combustion engine and an electric machine 2 as electric drive motor.
- the motor vehicle 1 an also be a purely electrically driven motor vehicle with the electric machine 2 .
- the motor vehicle 1 can have a battery 3 , in particular a high-voltage battery, for supplying the electric machine 2 with electric energy.
- the high-voltage battery 3 can be connected to an inverter or a converter 5 of the electric machine via an onboard grid 4 , in particular a high-voltage onboard grid.
- the electric machine 2 can for example be a synchronous machine or an asynchronous machine.
- the electric machine 2 can have a stator 6 and a rotor 7 .
- the stator 6 and the rotor 7 can be arranged in a common housing 8 .
- the stator 6 can have a coil device 9 , which can have multiple individual electric coils 10 of which one is shown in FIG. 3 .
- the stator 6 , the rotor 7 and the coil device 9 can be configured in a manner known per se.
- the converter 5 the coils 10 of the coil device 9 can be alternately supplied with a supply current from the battery 3 . This results in a magnetic rotary field in an air gap L in a manner known per se, by which the rotor is driven.
- the rotor 7 can be mechanically coupled with a drive shaft or short shaft 11 , i.e., it can in particular be connected to the shaft 11 in rotative fixed relation with the shaft. Via the shaft 11 the torque can be transmitted for example to a differential 12 and from there to drive wheels 13 of the motor vehicle 1 for driving the motor vehicle 1 .
- FIG. 2 For the following explanations reference is additionally made to FIG. 2 , FIG. 3 and FIG. 4 .
- electrical disturbances of the electric machine resulting from the described alternating supply of the coils with current and the switching edges that are hereby generated by the converter 5 may be coupled into neighboring components, in particular into the drive shaft 11 and the housing 8 via the open ends of the coils. From there they can for example be radiated off into a vehicle interior 14 for example as electromagnetic interfering radiation 15 or also into an environment U of the vehicle and thereby cause disturbances and/or exceed legal limits of the EMC.
- the coil arrangement 9 is partially arranged in an electrically conductive flux-guiding device 16 , which can for example be formed by a laminated core or laminated core segments.
- the open ends or winding overhangs 17 of the coils 10 which protrude out of the flux-guiding device 16 , are electrically and/or electromagnetically shielded in the electric machine 2 .
- a grounded shield or strip conductor i.e., a shielding element 18 is arranged which is for example electrically connected via an electric cable 19 , a wire or a litz wire with a frame potential connection 20 of the electric machine.
- the frame potential connection 20 can for example be formed by a flange for a screw connection of the housing 8 with a carrier part in a motor space of the motor vehicle 1 .
- the appropriate type of shielding (conductor cross section, material, conductor thickness along the propagation direction of the electrical disturbances) can for example be determined based on the provided switching frequencies of the converter 5 .
- the electric connection with the frame potential is symbolized in FIG. 2 by a frame potential sign 21 .
- the frame potential can for example be provided by the body of the motor vehicle 1 .
- the shielding element 18 forms a grounded shield, i.e., a shield with constant potential, which prevents or dampens the coupling of disturbances from the winding overhang 17 into neighboring components on the electric machine 2 .
- the shielding element 18 shields the winding overhang 17 , in particular toward the rotor 7 .
- the rotor 7 can for example have permanent magnets 22 and an electrically conductive carrier part 23 via which the magnetic force acting on the permanent magnets 22 is transmitted to the drive shaft 11 .
- the electrical disturbance can be transmitted into the drive shaft 11 via a capacitive coupling of the winding overhangs 17 .
- the shielding element 18 shields the winding overhang 17 in particular also directly against the drive shaft 11 . Further it is in particular provided that the shielding element 18 also shields the winding overhang against the housing 18 .
- the shielding element 18 can for example be formed by strip-shaped, spaced apart conductor elements 24 , which for example can be electrically connected with the connection line 19 via an electrical coupling-conductor element 25 .
- the coupling element 25 can be a further strip conductor or a wire. This results in a comb structure 26 of the shielding element 18 as shown in FIG. 4 .
- a line cross section 27 of the strip-shaped conductor elements 24 can for example be smaller than a quarter of the diameter D of the winding overhang, preferably smaller than an eighth of the diameter of the winding overhang.
- the diameter D of the winding overhang 17 is for example in a range of 25 millimeters to 30 millimeters.
- a further advantage of the electrical and/or electromagnetic shielding by means of the shielding element is that the amount of material for example of copper in the electric machine 2 can be reduced because no winding for a suppressor choke is required.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Motor Or Generator Frames (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014018432 | 2014-12-12 | ||
DE102014018432.3A DE102014018432A1 (en) | 2014-12-12 | 2014-12-12 | Motor vehicle electric motor with EMC measure |
DE102014018432.3 | 2014-12-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20160172943A1 US20160172943A1 (en) | 2016-06-16 |
US9923432B2 true US9923432B2 (en) | 2018-03-20 |
Family
ID=56082039
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/966,441 Active 2036-08-17 US9923432B2 (en) | 2014-12-12 | 2015-12-11 | Electric motor for a motor vehicle with EMC measure |
Country Status (3)
Country | Link |
---|---|
US (1) | US9923432B2 (en) |
CN (1) | CN105720723B (en) |
DE (1) | DE102014018432A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107846116A (en) * | 2016-09-18 | 2018-03-27 | 德昌电机(深圳)有限公司 | Motor and electric machine assembly |
DE102017210734A1 (en) * | 2017-06-26 | 2018-12-27 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Electromotive drive for a motor vehicle |
DE102020205151A1 (en) * | 2020-04-23 | 2021-10-28 | Robert Bosch Gesellschaft mit beschränkter Haftung | Driving device for a vehicle and a vehicle |
US11285975B1 (en) * | 2021-10-25 | 2022-03-29 | Young Suk WOO | Self-generating device and mechanical system using the same |
DE102021128536A1 (en) | 2021-11-03 | 2023-05-04 | Bayerische Motoren Werke Aktiengesellschaft | Protecting a vehicle from the effects of external electromagnetic interference |
TWI783824B (en) * | 2021-12-14 | 2022-11-11 | 赫德實驗有限公司 | Motor with stator grounding mechanism and stator grounding mechanism thereof |
Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB270438A (en) | 1926-02-19 | 1927-05-12 | John Sedgwick Peck | Improvements in or relating to dynamo electric machines |
DE3212308C2 (en) | 1982-04-02 | 1984-01-19 | Wilo-Werk Gmbh & Co Pumpen- Und Apparatebau, 4600 Dortmund | Method for applying a cover cap to an electric motor end winding |
US4528473A (en) * | 1983-02-26 | 1985-07-09 | Shinano Kenshi Kabushiki Kaisha | Permanent magnet type step motor |
DE8903959U1 (en) | 1989-03-31 | 1990-08-02 | Siemens AG, 1000 Berlin und 8000 München | Electrical machine with a stator core |
US5821652A (en) * | 1996-08-28 | 1998-10-13 | Marathon Electric Manufacturing Corporation | Dynamoelectric machines with shaft voltage prevention method and structure |
US5979087A (en) | 1998-01-16 | 1999-11-09 | Reliance Electric Industrial Company | Electric motor having electrostatic shield arrangement |
CN1253406A (en) | 1999-11-10 | 2000-05-17 | 华中理工大学 | Compensating pulse electric generator |
US6202285B1 (en) * | 1998-01-16 | 2001-03-20 | Reliance Electric Technologies, Llc | Electric motor having electrostatic shield arrangement |
DE10062596A1 (en) | 1999-12-17 | 2001-06-21 | Aisin Aw Co | Electric drive motor arrangement with measurement sensor for detecting rotor position, specifically used for electric- and hybrid-vehicles, includes screening element for screening stray |
DE10105983A1 (en) | 2001-02-09 | 2002-09-12 | Siemens Ag | Electrical machine has winding heads in axial end of stator enclosed at least partly by basket shaped part whose enveloping volume can be altered by shaping and/or adding material |
CN101145725A (en) | 2007-07-30 | 2008-03-19 | 哈尔滨工业大学 | Self-excitation full empty core passive compensation pulse generator |
US20080088187A1 (en) * | 2006-10-17 | 2008-04-17 | Hitachi, Ltd | Electric Motor with Reduced EMI |
DE202010009940U1 (en) | 2010-07-07 | 2011-10-27 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Suppression choke for an electric motor |
EP2541740A1 (en) | 2011-06-29 | 2013-01-02 | Grundfos Holding A/S | Stator |
CN103441587A (en) | 2013-08-23 | 2013-12-11 | 中国核动力研究设计院 | Shielding structure for shielding stator core of motor and stator closed slot threading technology |
CN103457380A (en) | 2013-08-28 | 2013-12-18 | 哈尔滨电机厂有限责任公司 | Stator end structure of surge generator |
-
2014
- 2014-12-12 DE DE102014018432.3A patent/DE102014018432A1/en active Pending
-
2015
- 2015-12-11 CN CN201510920203.7A patent/CN105720723B/en active Active
- 2015-12-11 US US14/966,441 patent/US9923432B2/en active Active
Patent Citations (18)
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GB270438A (en) | 1926-02-19 | 1927-05-12 | John Sedgwick Peck | Improvements in or relating to dynamo electric machines |
DE3212308C2 (en) | 1982-04-02 | 1984-01-19 | Wilo-Werk Gmbh & Co Pumpen- Und Apparatebau, 4600 Dortmund | Method for applying a cover cap to an electric motor end winding |
US4528473A (en) * | 1983-02-26 | 1985-07-09 | Shinano Kenshi Kabushiki Kaisha | Permanent magnet type step motor |
DE8903959U1 (en) | 1989-03-31 | 1990-08-02 | Siemens AG, 1000 Berlin und 8000 München | Electrical machine with a stator core |
US5821652A (en) * | 1996-08-28 | 1998-10-13 | Marathon Electric Manufacturing Corporation | Dynamoelectric machines with shaft voltage prevention method and structure |
US5979087A (en) | 1998-01-16 | 1999-11-09 | Reliance Electric Industrial Company | Electric motor having electrostatic shield arrangement |
US6202285B1 (en) * | 1998-01-16 | 2001-03-20 | Reliance Electric Technologies, Llc | Electric motor having electrostatic shield arrangement |
CN1253406A (en) | 1999-11-10 | 2000-05-17 | 华中理工大学 | Compensating pulse electric generator |
DE10062596A1 (en) | 1999-12-17 | 2001-06-21 | Aisin Aw Co | Electric drive motor arrangement with measurement sensor for detecting rotor position, specifically used for electric- and hybrid-vehicles, includes screening element for screening stray |
US20010013731A1 (en) | 1999-12-17 | 2001-08-16 | Keiichi Shinohara | Motor |
DE10105983A1 (en) | 2001-02-09 | 2002-09-12 | Siemens Ag | Electrical machine has winding heads in axial end of stator enclosed at least partly by basket shaped part whose enveloping volume can be altered by shaping and/or adding material |
US20080088187A1 (en) * | 2006-10-17 | 2008-04-17 | Hitachi, Ltd | Electric Motor with Reduced EMI |
CN101145725A (en) | 2007-07-30 | 2008-03-19 | 哈尔滨工业大学 | Self-excitation full empty core passive compensation pulse generator |
DE202010009940U1 (en) | 2010-07-07 | 2011-10-27 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Suppression choke for an electric motor |
EP2541740A1 (en) | 2011-06-29 | 2013-01-02 | Grundfos Holding A/S | Stator |
US20130002060A1 (en) | 2011-06-29 | 2013-01-03 | Grundfos Holding A/S | Stator |
CN103441587A (en) | 2013-08-23 | 2013-12-11 | 中国核动力研究设计院 | Shielding structure for shielding stator core of motor and stator closed slot threading technology |
CN103457380A (en) | 2013-08-28 | 2013-12-18 | 哈尔滨电机厂有限责任公司 | Stator end structure of surge generator |
Non-Patent Citations (2)
Title |
---|
Chinese Search Report dated Nov. 3, 2017 with respect to counterpart Chinese patent application 2015109202037. |
English translation of Chinese Search Report dated Nov. 3, 2017 with respect to counterpart Chinese patent application 2015109202037. |
Also Published As
Publication number | Publication date |
---|---|
DE102014018432A1 (en) | 2016-06-16 |
CN105720723A (en) | 2016-06-29 |
US20160172943A1 (en) | 2016-06-16 |
CN105720723B (en) | 2019-05-07 |
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